Main.cc:1:1: error: ‘include’ does not name a type; did you mean ‘__has_include’? include ^~~~~~~ __has_include Main.cc: In function ‘int main()’: Main.cc:6:5: error: ‘cin’ was not declared in this scope cin>>l>>n>>m; ^~~ Main.cc:6:5: note: suggested alternative: ‘main’ cin>>l>>n>>m; ^~~ main Main.cc:7:5: error: ‘printf’ was not declared in this scope printf("%8d%8d%8d",l,n,m); ^~~~~~ Main.cc:7:5: note: suggested alternative: ‘int’ printf("%8d%8d%8d",l,n,m); ^~~~~~ int